Translation of "Tenro" in English

Sondando as causas misteriosas do portento, / procuro de outro arbusto arrancar tenro galho / e da casca também goteja o sangue impuro.

Once more / a limber sapling from the soil I tore; / once more, persisting, I resolved in mind / with inmost search the causes to explore / and probe the mystery that lurked behind; / dark drops of blood once more come trickling from the rind.